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Temperature Mediated Interactions between the Aggressiveness of Phytophthoradrechsleri f. sp. Cajani and Activity of Defense Enzymes in Pigeonpea

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Title Temperature Mediated Interactions between the Aggressiveness of Phytophthoradrechsleri f. sp. Cajani and Activity of Defense Enzymes in Pigeonpea
 
Creator Senthilraja, G
Jyothi Reddy, C
Pande, S
Sharma, M
 
Subject Pigeonpea
 
Description A pigeonpea field survey was conducted during the year 2010–2013 in the semi-arid
tropics of India (Andhra Pradesh, Karnataka and Maharashtra), where the temperature is
usually high. Phytophthora blight (PB) of pigeonpea caused by Phytophthoradrechslerif.sp.
cajani (Pdc) was widespread in all the surveyed areas irrespective of cultivars sown and
disease incidence varied between 5–60%.Therefore, the objective of the study was to
study the effect of range of temperatures (15–40 °C) on the PB development and on the
activity of plant defense enzymes. Under controlled environment studies, we found that
disease appeared in all the temperatures with varied incubation period (IP). At higher
temperatures (30, 35 and 40 °C), IP was 32, 26 and 18 hours, however at 25, 20 and 15 °C,
disease was delayed with an IP of 63, 126 and 225 hours, respectively. To further
understand the host, pathogen and environment interactions, biochemical analysis of
defense enzymes viz., phenylalanine ammonia lyase, peroxidase, polyphenoloxidase and
catalase was studied at all temperatures after 0, 24, 48, 72 and 96 hours of inoculation.
Activity of defense enzymes in inoculated plants increased progressively at temperatures
25–40 °C during the infection process and then a decline was noticed after the disease
progressed. However, at lower temperatures, significant difference was not found in
inoculated and uninoculated plants. This study depicts the aggressiveness of Pdcat higher
temperatures and will be useful in further strengthening the crop protection practices to
mitigate the effect of climate change on plant diseases.
 
Date 2013-12
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/9209/1/76.pdf.pdf
Senthilraja, G and Jyothi Reddy, C and Pande, S and Sharma, M (2013) Temperature Mediated Interactions between the Aggressiveness of Phytophthoradrechsleri f. sp. Cajani and Activity of Defense Enzymes in Pigeonpea. In: Proceedings of the International Conference on Green India: Strategic Knowledge for Combating Climate Change: Prospects & Challenges, December 5 -7, 2013, Pondicherry.